Page author: David Giblin
Cassiope mertensiana
Mertens's moss-heather
WTU specimens
Other herbaria

Distribution: Occurring on both sides of the Cascades in Washington; Alaska south to California, east to Montana, Idaho, and Nevada.

Habitat: Open, rocky areas in the alpine and subalpine.

Flowers: July-September

Origin: Native

Conservation Status: Not of concern


Mat-forming shrubs, the flowering stems 5-30 cm. tall, glabrous or finely pubescent.


Leaves opposite, 4-ranked, sessile, oppressed, scale-like, 2-5 mm. long, ovate-lanceolate, rounded on the back.


Flowers several near the branch tips, 5-8 mm. long; pedicels 5-30 mm. long, glabrous or puberulent; sepals nearly distinct, 5-lobed, ovate, reddish; corolla white, bell-shaped, the 5 lobes ovate, much shorter than the tube; stamens 10, included; anthers globose, with recurved awns from the back, opening by false terminal pores; ovary superior.


Fruit a 5-celled, globose capsule.

Accepted Name:
Cassiope mertensiana (Bong.) G. Don
Publication: Gen. Hist. 3: 829. 1834.

Synonyms & Misapplications:
Andromeda mertensiana Bong.
ssp. mertensiana – Mertens's moss-heather
Additional Resources:

PNW Herbaria: Specimen records of Cassiope mertensiana in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Cassiope mertensiana checklist entry.

E-Flora BC: Cassiope mertensiana atlas page.

CalPhotos: Cassiope mertensiana photos.

USDA Plants: Cassiope mertensiana information.

52 photographs:
Group by